10.4. Installing and Using Site Collection Content Types
After you publish a form as a content type, you have to specify the form library where you want to use that content type. However, published content types become available to all libraries in not only the current site where that library resides, but also all child site libraries. So how can you tell an existing library to use your new content type?
10.4.1. Adding a Content Type to a Library
Open the specific library where you want to use the content type. Select the option Document Library Settings from the Settings menu option at the top of the library. If you have not previously gone into the Advanced Settings to allow the library to manage content types, you need to do that first. ...